Germaine (asker) Jan 19, 2011:

Phil, Sorry for the lack of context. I understand that works of a certain value and extent (and expressed in $/m) had to be carried out over a certain period of time. Since they were not, the area to be covered is reduced pro rata using a price/meter calculated en divisant le montant total d'adjudication de l'offre d'entreprise correspondant au métré prévu en 20XX par le métré devisé dans le bordereau des prix.